On the other hand, over the same time, lyrics related to positive emotions, social interaction and a focus on others have decreased.

而另一方面，关于积极情感、社会交往和关注他人这类歌词却明显减少。

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We can now start to think about domains where it's the social interaction, which is the core means by which a robot helps someone, through motivating them, or giving positive reinforcement.

我们现在可以开始考虑研究社交互动方面的领域，也是通过激励和正面强化机器人来帮助人类的核心方式。

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It lacks a necessary link between the training institutions and employment market to social sports instructors, which is hard to form a positive interaction between them.

社会体育指导员培养和就职市场缺少必要的联系纽带，难以在培养和需求二者间形成良性互动。

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"More connected individuals might be better equipped to perceive social cues like facial expression" and might derive more positive experience from social interaction, writes Dr. Dickerson in a recent paper.

WSJ: When Social Skills Are a Warning